Wasser Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:

S-Sätze Betriebsanweisung:

Chemische Eigenschaften

colourless liquid

Verwenden

For use in the preparation of cell culture media, and cell suspension and washing solutions.

Verwenden

For use in embryo manipulation.

Verwenden

water is listed also as catalyzed, deionized, demineralized, distilled, pure spring, and purified water. Water is an important skin component and is essential for its proper functioning. It is the most common ingredient used in cosmetic formulations and, therefore, is generally listed first on product labels. Water is usually processed to eliminate hardness and minerals, and to avoid product contamination.

Verwenden

Water is a colorless, odorless, tasteless liquid formed by the combi-
nation of two hydrogen and one oxygen atoms. it allows substances
to dissolve and functions as a solvent, dispersing medium, hydrate,
and promoter of chemical changes. it is a major constituent in
meats, fruits, and vegetables. distilled water is obtained by conden-
sation of water vapor.

Definition

ChEBI: An oxygen hydride consisting of an oxygen atom that is covalently bonded to two hydrogen atoms.

läuterung methode

Conductivity water (specific conductance ca 10-7 mho) can be obtained by distilling water in a steam-heated tin-lined still, then, after adding 0.25% of solid NaOH and 0.05% of KMnO4, distilling once more from an electrically heated Barnstead-type still, taking the middle fraction into a Jena glass bottle. During these operations suitable traps must be used to protect against entry of CO2 and NH3. Water, only a little less satisfactory for conductivity measurements (but containing traces of organic material) can be obtained by passing ordinary distilled water through a mixed bed ion-exchange column containing, for example, Amberlite resins IR 120 (cation exchange) and IRA 400 (anion exchange), or Amberlite MB-1. This treatment is also a convenient one for removing traces of heavy metals. (The metals Cu, Zn, Pb, Cd and Hg can be tested for by adding pure concentrated ammonia to 10mL of sample and shaking vigorously with 1.2mL of 0.001% dithizone in CCl4. Less than 0.1Yg of metal ion will impart a faint colour to the CCl4 layer.) For almost all laboratory purposes, simple distillation yields water of adequate purity, and most of the volatile contaminants such as ammonia and CO2 are removed if the first fraction of distillate is discarded. Most laboratories have glass stills that “doubly” or “trebly” distil water. [See “water” in Chapter 1.]